FLOOD08527

• County: Weld
• County: Logan
• Stream Name: Igo Creek Tributary
• Basin: South Platte
• Title: Pawnee Buttes Rainfall documentation
• Date: 4/14/1999
• Prepared For: Weld County
• Prepared By: USDA
• Floodplain - Doc Type: Flood Documentation Report

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PLATTE RIVER BASIN
06160200 ICO CREEK TRIBUTARY NEAR KEOTA, COLO.

415

LOCATION.--Lat 40047'24", long 103057'18", in SW~SW'- see.34, T.IO N., R.S9 W., Weld County, on right
bank 0.3 mi (0.5 km) upstream from bridge on county road and 8.5 mi (13.7 km) northeast of Keata.
DRAINAGE AREA.--l.38 mil (3.57 km2), corrected. Area at site prior to Mar. 30, 1972, 2.59.11 (6.71 km1).
P~RIOD OF RECORD.--May 23, 1969, to current year (no winter records). Prior to Mar. 3D, 1972, at site
0.9 mi (1.4 km) downstream.
GAGE...Flood-hydrograph and rainfall recorders (dual digitals).
Pf.~ARKS.--Detailed rainfall-runoff data for the storm of Aug. 23~ 1971, not provided because total
flood volume was insignificant. Basin cover is natural prairie vegetation.
STA~E-DISCHARGE RELATION.--Rating developed on basis of step-backwater analysis of reach of natural
stream channel.

tXTREMES.--Water year 1975: Maximum discharge. <S ft3/s (<0.14 m3/s); no flow most of year.
Water year 1976: Maximum discharge~ <S ft3/s (<0.14 m3/s); no flow most of year~
Water year 1977: Maximum discharge. 9.5 ft'ls (0.21 m3/s) Aug. 23; no flow most of year.
Period of record: Maximum discharge, 57 ft3/s (1.61 m3/s) Sept. 11. 1973; no flow most of each
year.